Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (1): 52-69.doi: 10.13278/j.cnki.jjuese.20180332

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Characteristics of Formation-Pressure-Structure of Qikou Sag, Bohai Bay Basin

Jiang Wenya1,2, Song Zezhang1,2, Zhou Lihong3, Pu Xiugang3, Wang Na3, Dai Kun3, Wan Weichao1,2, Liu Xiangbai1,2   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    3. Research Institute of Exploration and Development, PetroChina Dagang Oilfield Company, Tianjin 300280, China
  • Received:2018-12-13 Published:2020-02-11
  • Supported by:
    Supported by National Key Research and Development Project of China (2017YFC0603106), National Natural Science Foundation for Young Scientists of China (41802148), Independent Research Project of the State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing) (PRP/indep-04-1611) and Research Startup Fund of China University of Petroleum (Beijing) (2462017YJRC025)

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Abstract: It is of great theoretical and practical significance for the classification of petroleum-bearing systems, the evaluation of favourable petroleum migration pathways, and the clarification of sweet spot for exploration to deepen the study of formation-pressure-structure in oil-bearing sedimentary basins and to clarify the spatial distribution of abnormal pressures. In order to carry out the secondary exploration of the oil-rich sags in Bohai Bay basin, we took Qikou sag as the research object and focused on its formation pressure structure. By calibrating the measured formation pressure, the single well formation-pressure-pattern analysis, the well-correlation profile analysis, and the 2-D seismic profile analysis were integrated to clarify the formation-pressure-pattern of Qikou sag. Four vertical formation-pressure-patterns were identified:the pattern with a single overpressure zone, the pattern with double overpressure zones, the pattern with multiple overpressure zones,and the hydrostatic formation pressure pattern. Vertically, there are three types of pressure systems in Qikou sag:single-overpressure-system, double-overpressure-system, and hydrostatic system. The double-overpressure-system is the main type of overpressure system in Qikou sag, which is widely developed in the main sag and the sub-sags. In the direction from the main sag to the edge of the basin, the double-overpressure-system gradually transits into the single-overpressure-system and the hydrostatic system. The single-overpressure-system is mainly distributed in the slope areas and the buried hills, such as Qibei high slope and Yangsanmu-Koucun buried hill. The hydrostatic system is mainly distributed in the Shenqingzhuang and Chengbei slope areas, farther away from the main sag. The seals of the upper and lower overpressure systems are located in Dongying Formation and Es3 Formation, respectively. Laterally, the overpressure systems are controlled by the basin edges and deep faults. The formation of the upper overpressure system is mainly controlled by undercompaction, and is distributed in a ring around the main sag; while the formation of the lower overpressure system is mainly controlled by hydrocarbon generation, and is centered on the main sag and sub-sags. In the future, the main target of ultra deep gas exploration in Qikou area will be the natural gas stored in the lower overpressure system.

Key words: abnormal formation pressure, overpressure, formation pressure pattern, Qikou sag, Bohai Bay basin

CLC Number: 

  • P618.13
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